Deformation textures of AA8011 aluminum alloy sheets severely deformed by accumulative roll bonding |
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Authors: | Hyoung Wook Kim Suk Bong Kang Nobuhiro Tsuji Yoritoshi Min Amino |
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Affiliation: | (1) the Department of Materials Technology, Korea Institute of Machinery and Materials, 641-010 Changwon, Korea;(2) the Department of Adaptive Machine Systems, Oska University, 565-0871 Osaka, Japan |
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Abstract: | A fully annealed AA8011 aluminum alloy sheet containing a number of large particles (~5 μm) was severely deformed up to an equivalent strain of 12 by an accumulative roll-bonding (ARB) process. The texture evolution
during the ARB process was clarified, along with the microstructure. The ARB-processed aluminum alloy sheets had a different
texture distribution through the sheet thickness, due to the high friction between the roll and the material during the ARB
process. The shear textures composed of {001} ?110? and {111} ?110? orientations developed at the sheet surface, while the
rolling textures, including Cu {112} ?111? and Dillamore {4,4,11} ?11,11,8? orientations, developed at the sheet center. The
textural change from a shear texture to a rolling texture at the sheet center during the ARB process contributed to an increase
in the fraction of high-angle boundaries. Also, a large number of second-phase particles in the AA8011 alloy sheets weakened
the texture. Up to the medium strain range (below ?=6.4), relatively weak textures developed, due to the inhomogeneous deformation around the second-phase particles; after the
strain of 6.4, strong rolling-texture components, such as the Dillamore and Cu orientations, developed. This remarkable textural
change can be explained by the reprecipitation of fine particles in grain interiors. |
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